Why does it matter where you fall on the introvert-extrovert spectrum?

Because introversion and extroversion are at the heart of human nature. And when you make life choices that are congruent with your temperament, you unleash vast stores of energy.

Conversely, when you spend too much time battling your own nature, the opposite happens — you deplete yourself. Too many people live lives that don't suit them — introverts with frenetic social schedules, extroverts with jobs that require them to sit in front of their computers for hours at a stretch. We all have to do things that don't come naturally — some of the time. But it shouldn't be all the time. It shouldn't even be most of the time.